Properties: VINNAPAS® 920 offers improved adhesion properties over conventional plasticized VAE copolymer dispersions due to a unique polymerization process that combines high ethylene content and carboxyl functionality into the backbone of the polymer. The stabilization of this dispersion with poly(vinyl alcohol) provides high wet tack, good setting speed, and good machinability. The carboxylic acid functionality provides crosslinking sites and a route for the dispersion to be thickened as the pH is increased. The dried film of this dispersion exhibits residual dry tack and greater flexibility due to the low Tg. Its excellent film coalescence offers good film clarity, water resistance and green strength over conventional VAE's. The low Tg of the dispersion provides greater flexibility, adhesion and dry tack than conventional VAE's.

Application: VINNAPAS® 920 has excellent wet out and adhesion to difficult-to-adhere substrates like polymeric and metallized polyethylene, polypropylene, and polyester terephthalate films. It can be used in various specialty packaging and converting adhesive formulations to promote adhesion as the primary base dispersion or as an adhesion promoter for applications including but not limited to film to board/paper laminating, carton window film and specialty folding carton manufacturing. The unique properties of this dispersion allow it to be used as an adhesion promoter and modifier in other formulations where flow, wet-out, and specific adhesion are required. VINNAPAS® 920 is a semi-pressure sensitive VAE offering low tack and high shear dry film properties. other pressure sensitive polymer systems.

Information provided by Wacker Chemie AG.